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S = 20cm
t = 10seg
Vo = 0
V = 40 km/h
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20 cm / 100 = 0,2 m
S = So + Vo + a
0,2 = 0 + 0 + a
0,2 = a100
0,2 = 50a
a = 0,2 / 50
a = 0,004
40 km/h / 3,6 = 144 m/s
V = Vo + at
144 = 0 + 0,004t
144 = 0,004t
t = 144 / 0,004
t = 36000 seg
36000 seg / 3600 = 10 horas